//创建和初始化地图函数：
function initMap() {
  createMap();//创建地图
  setMapEvent();//设置地图事件
  addMapControl();//向地图添加控件
  addMapOverlay();//向地图添加覆盖物
}

function createMap() {
  map = new BMap.Map('college_map');
  map.centerAndZoom(new BMap.Point(125.269793, 43.829087), 17);
}

function setMapEvent() {
  map.enableScrollWheelZoom();
  map.enableKeyboard();
  map.enableDragging();
  map.enableDoubleClickZoom()
}

function addClickHandler(target, window) {
  target.addEventListener('click', function () {
    target.openInfoWindow(window);
  });
}

function addMapOverlay() {
  var markers = [
    {title: '继续教育学院', imageOffset: {width: 0, height: 3}, position: {lat: 43.829379, lng: 125.269425}},
  ];
  for (var index = 0; index < markers.length; index++) {
    var point = new BMap.Point(markers[index].position.lng, markers[index].position.lat);
    var marker = new BMap.Marker(point, {
      icon: new BMap.Icon('http://api.map.baidu.com/lbsapi/createmap/images/icon.png', new BMap.Size(20, 25), {
        imageOffset: new BMap.Size(markers[index].imageOffset.width, markers[index].imageOffset.height)
      })
    });
    var label = new BMap.Label(markers[index].title, {offset: new BMap.Size(25, 5)});
    var opts = {
      width: 200,
      title: markers[index].title,
      enableMessage: false
    };
    var infoWindow = new BMap.InfoWindow(markers[index].content, opts);
    marker.setLabel(label);
    addClickHandler(marker, infoWindow);
    map.addOverlay(marker);
  }
  ;
}

//向地图添加控件
function addMapControl() {
  var scaleControl = new BMap.ScaleControl({anchor: BMAP_ANCHOR_BOTTOM_LEFT});
  scaleControl.setUnit(BMAP_UNIT_IMPERIAL);
  map.addControl(scaleControl);
  var navControl = new BMap.NavigationControl({anchor: BMAP_ANCHOR_TOP_LEFT, type: 3});
  map.addControl(navControl);
  var overviewControl = new BMap.OverviewMapControl({anchor: BMAP_ANCHOR_BOTTOM_RIGHT, isOpen: false});
  map.addControl(overviewControl);
}

var map;
initMap();